Removing the Notoriety/Prestige system is removing a core part of APB; I personally am opposed to it being removed, and would much prefer to see improvements made to it.
What are the big pain points of the current system?
Players TKing to lose N5/P5
No way for Enforcers to bribe down
"Mission interference" AKA
These are really the three biggest issues, and unless I'm overlooking something obvious, every other problem stems from one of these.
The in-lore explanation of N5/P5 is that whoever reaches that level is so dangerous to the opposing faction that it becomes open season on them to literally anyone in the district; the TKing issue could ostensibly be hand-waved with the lore as well, given the notion that Enforcers are basically criminals with a badge, but I'm not 100% on board with that.
The system needs some looking at for sure, but should absolutely not go away.